I have used this style Boston coupling about 2 years, putting on about 250 hours with no wear.
I have used this type of coupling in many things over the last 45 years.
and I like it over the rag joint,as it runs dead true and still has a little flex/cushion.
It also it is a breeze to remove the driveshaft, having only to loosen the set screw and slide the coupling half forward.
My rag joint was still good on the front so I havent replaced that one yet.
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